In recent years, the rapid development of facilities for vegetables has played an important role in increasing farmers' income. However, due to the high temperature in the greenhouse, high humidity, poor ventilation and light transmission conditions, such as improper fertilization can easily produce fertilizer damage, reduce production and efficiency, and even serious shed damage. Vaccine For Rabies Prophylaxis Travelers to areas where rabies is endemic may be at risk, especially if they are likely to come in contact with animals in areas where dog or other animal rabies is enzootic and immediate access to appropriate medical care is unlikely. Canine rabies remains highly endemic in certain areas of the world. Need for rabies preexposure vaccination depends on the nature of risk and associated level of potential exposure. preexposure vaccination based on local incidence of rabies in the country to be visited, availability of appropriate agents for rabies postexposure prophylaxis in that country, and intended activity and duration of stay Vaccine For Rabies Prophylaxis,Rabies Prophylaxis Vaccine,Freeze Rabies Prophylaxis Vaccine,Freeze Vaccine For Rabies Prophylaxis Changchun Zhuoyi Biological Co., Ltd , https://www.zhuoyi-bio.com
cause
Excessive use of direct damage to greenhouse vegetables often results in high levels of fertilizers, especially if the amount of chemical fertilizers or fast-acting organic fertilizers (human waste, cake fertilizers, etc.) is too high, which can easily cause fertilizer damage. The leaves are deformed and the vegetables are gradually wilting and even withered when severe.
Inappropriate fertilization method causes damage to the topdressing acupuncture points, the strips are applied close to the roots of the vegetables, or the organic manure is used as a base fertilizer, and the mass of the fertilizers is large, causing reverse osmosis of the vegetables. The edges of the vegetable leaves are burned by the boiling water and are scorched after a few days.
Harmful gas damage When ammonium nitrogen fertilizer or fresh organic fertilizer is applied in a greenhouse, the temperature inside the greenhouse is too high and it will decompose a large amount of ammonia in a short period of time. This is especially serious if the fertilizer is applied to the soil surface and it is not covered. . When sensitive vegetables such as cucumber and tomato are damaged, they mainly show watery spots on the leaves. The cells lose water and form brown spots. In severe cases, there are massive brown spots between the veins.
The accumulation of salt in poisonous greenhouses has a large amount of fertilizers. Soluble salt in the soil rises with groundwater to the soil surface, causing salt accumulation in the topsoil. Due to the high salt content in the surface layer, the vegetables have physiological obstacles, such as short plants, dark green leaves, poor growth, and rimming of the leaf margin.
Reduced availability of nutrients When an excessive amount of nutrients is applied, antagonism occurs, resulting in a decrease in the effectiveness of other elements, and vegetables exhibit certain elemental deficiencies. For example, nitrogen overdose causes calcium deficiency, which causes dry burning of tomato umbilical rot and cabbage. Excessive phosphorus will reduce the effectiveness of zinc. Potassium will reduce the effectiveness of calcium, magnesium and boron.
Prevention
Controlling the amount of chemical fertilizers as long as the amount of chemical fertilizers is controlled, the damage will be greatly reduced, and the mid-range level is appropriate.
Grasp the principle of a small number of times to promote full-depth application of stratification, stratified application method, can play a fertilizer, reduce volatile losses, reduce the role of direct injury, should not be spread on the surface, the fertilizer is evenly distributed throughout the cultivation layer . The amount of topdressing chemical fertilizer should not be too much, and at the same time, pay attention to fertilization to properly water, keep the soil moist, reduce the concentration of the solution, to reduce or avoid injury.
Balanced fertilization must start from the control of the amount of fertilizer, according to the nutritional needs of different periods of vegetable growth, so that nitrogen, phosphorus, potassium balanced fertilization, to change the partial nitrogen fertilizer for nitrogen, phosphorus, potassium, organic fertilizer, NPK Fertilizer and trace elements should be applied together. Do not unilaterally pursue high yields and blindly apply fertilizer.
Increasing organic fertilizers and applying adequately cooked organic manure can improve soil structure, improve soil buffering performance, increase soil fertility, reduce fertilizer use, and reduce salt damage. Fresh organic fertilizer can be applied only after it has been thoroughly cooked.
Prompt ventilation and ventilation Use high temperature periods before and after noon, and properly open the vents for ventilation to reduce the concentration of toxic gases caused by fertilization in the shed to reduce injuries.